/Engine/Source/Editor/ClassViewer/Public/ClassViewerFilter.h
This function checks whether a node passes the filter defined by IsClassAllowed/IsUnloadedClassAllowed.
virtual bool IsNodeAllowed ( const [FClassViewerInitializationOptions](API\Editor\ClassViewer\FClassViewerInitializationOption-) & InInitOptions, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< FClassViewerNode > & Node, const bool bCheckTextFilter )